/*jshint bitwise: false*/
'use strict';

angular
  .module('metadatamanagementApp')
  .service(
    'Base64',
    function() {
      var keyStr = 'ABCDEFGHIJKLMNOP' + 'QRSTUVWXYZabcdef' +
        'ghijklmnopqrstuv' + 'wxyz0123456789+/' + '=';
      this.encode = function(input) {
        var output = '';
        var chr1;
        var chr2;
        var chr3 = '';
        var enc1;
        var enc2;
        var enc3;
        var enc4 = '';
        var i = 0;

        while (i < input.length) {
          chr1 = input.charCodeAt(i++);
          chr2 = input.charCodeAt(i++);
          chr3 = input.charCodeAt(i++);

          enc1 = chr1 >> 2;
          enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
          enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
          enc4 = chr3 & 63;

          if (isNaN(chr2)) {
            enc3 = enc4 = 64;
          } else if (isNaN(chr3)) {
            enc4 = 64;
          }

          output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2) +
            keyStr.charAt(enc3) + keyStr.charAt(enc4);
          chr1 = chr2 = chr3 = '';
          enc1 = enc2 = enc3 = enc4 = '';
        }

        return output;
      };

      this.decode = function(input) {
        var output = '';
        var chr1;
        var chr2;
        var chr3 = '';
        var enc1;
        var enc2;
        var enc3;
        var enc4 = '';
        var i = 0;

        // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, '');

        while (i < input.length) {
          enc1 = keyStr.indexOf(input.charAt(i++));
          enc2 = keyStr.indexOf(input.charAt(i++));
          enc3 = keyStr.indexOf(input.charAt(i++));
          enc4 = keyStr.indexOf(input.charAt(i++));

          chr1 = (enc1 << 2) | (enc2 >> 4);
          chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
          chr3 = ((enc3 & 3) << 6) | enc4;

          output = output + String.fromCharCode(chr1);

          if (enc3 !== 64) {
            output = output + String.fromCharCode(chr2);
          }
          if (enc4 !== 64) {
            output = output + String.fromCharCode(chr3);
          }

          chr1 = chr2 = chr3 = '';
          enc1 = enc2 = enc3 = enc4 = '';
        }
      };
    }).factory('StorageService', ['$window',  function($window) {
    return {

      get: function(key) {
        return JSON.parse($window.localStorage.getItem(key));
      },

      save: function(key, data) {
        $window.localStorage.setItem(key, JSON.stringify(data));
      },

      remove: function(key) {
        $window.localStorage.removeItem(key);
      },

      clearAll: function() {
        $window.localStorage.clear();
      }
    };
  }]);

